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-   -   sloping top tubes? (https://www.bikeforums.net/singlespeed-fixed-gear/177092-sloping-top-tubes.html)

brunop 02-27-06 07:14 AM

sloping top tubes?
 
ever acceptable? :)

p3ntuprage 02-27-06 07:37 AM

forward sloping, hell yeah.

http://www.yellowjersey.org/axr.jpg

fsnl
sparky

queerpunk 02-27-06 07:39 AM

only acceptable with apehanger bars.

goggles 02-27-06 09:49 AM

Does anyone know the name of the sweet TT crankset featured in the 3rensho pic?
Would love to know for my Schwinn TT build.

Fugazi Dave 02-27-06 09:56 AM

Not a problem AFAIC. Hell, I think compact geometry is sexy.

crushkilldstroy 02-27-06 10:07 AM

drives me ****ing berzerk. makes me want to grab a sledge and pound it down to where it's level.

plantdude 02-27-06 10:11 AM

How sloping are you talking about? My newest addition to the fleet has a slightly sloping top tube, and I really like it:

http://velospace.org/node/218

Sloping top tubes on both road bikes and track bikes have grown on me over the past few years, as they have become more ubiquitous. If the bike fits and is comfortable, then it doesn't matter what the top tube is doing...

koyman 02-27-06 10:16 AM

only only only forwardsloping, and i love apehangers as well as that yj rensho

jim-bob 02-27-06 10:46 AM

Sloping top tubes are where it's at.

baxtefer 02-27-06 12:06 PM

sloping is fine, and practical.
I'm mentally designing my custom frame around a sloping TT. and pacenti lugs.

asterisk 02-27-06 12:09 PM

only if it has an njs stamp on it.

sashae 02-27-06 12:30 PM

Funny bikes make me dizzy.

http://www.blackbirdsf.org/bikes/ima...ho/3rensho.jpg

rithem 02-27-06 12:33 PM

makes for a stiffer frame (smaller triangles) + more clearance for your legs when sprinting. I like em'.

daveed 02-27-06 12:42 PM


Originally Posted by plantdude
How sloping are you talking about? My newest addition to the fleet has a slightly sloping top tube, and I really like it:

http://velospace.org/node/218

Sloping top tubes on both road bikes and track bikes have grown on me over the past few years, as they have become more ubiquitous. If the bike fits and is comfortable, then it doesn't matter what the top tube is doing...

Holy s--t! Apes could hang off those drops, Planetdude. What are those ... like 50s? As for sloping top tubes, theyve gorwn on me too. I converted a slopy trek hybrid, souping it up that cycling enthusiasts now wonder what I'm doing riding a 'cross bike fixed.

schnee 02-27-06 12:52 PM

As a new owner of the much-maligned Bowery, I think sloping top tubes are spiffy. They look aggressive and modern. Horizontal top tubes are functionally inferior to sloping ones, so hanging on to them for basically aesthetic reasons is... quaint.*

It's much like those Harley riders who pay all that extra money for an engine that's so poorly designed, it literally shakes itself apart over time. It also gets 75% of the power of comparable engines with different strokes. Why do folks keep riding Harleys? Adherence to 'tradition', and a smidge of 'it sounds cool'.

* This is my first post in the SS forums, so in keeping with the way everyone else seems to talk to each other here, I've added a gratuitous troll. Feel free to hurl whatever insults you want, because I'm 100% hipster-proof.

rvabiker 02-27-06 01:01 PM

Sloping up...ugly. Sloping down...thumbs up.

ch0mb0 02-27-06 01:36 PM


Originally Posted by brunop
ever acceptable? :)


totally acceptable!

http://img497.imageshack.us/img497/9...iki12050hy.jpg

baxtefer 02-27-06 01:40 PM


Originally Posted by ch0mb0
totally acceptable!

funny bikes don't make me laugh

bleh.

brunop 02-27-06 03:37 PM


Originally Posted by plantdude
How sloping are you talking about? My newest addition to the fleet has a slightly sloping top tube, and I really like it:

http://velospace.org/node/218

Sloping top tubes on both road bikes and track bikes have grown on me over the past few years, as they have become more ubiquitous. If the bike fits and is comfortable, then it doesn't matter what the top tube is doing...

that looks dap, plant. nice ride. i'm gonna slope it at 4.5 degrees i think. at least now that i checked wif ya'll! thanks! :)

baxtefer 02-27-06 03:40 PM

go for it!

crushkilldstroy 02-27-06 03:44 PM


Originally Posted by schnee
As a new owner of the much-maligned Bowery, I think sloping top tubes are spiffy. They look aggressive and modern. Horizontal top tubes are functionally inferior to sloping ones, so hanging on to them for basically aesthetic reasons is... quaint.*

It's much like those Harley riders who pay all that extra money for an engine that's so poorly designed, it literally shakes itself apart over time. It also gets 75% of the power of comparable engines with different strokes. Why do folks keep riding Harleys? Adherence to 'tradition', and a smidge of 'it sounds cool'.

* This is my first post in the SS forums, so in keeping with the way everyone else seems to talk to each other here, I've added a gratuitous troll. Feel free to hurl whatever insults you want, because I'm 100% hipster-proof.

not trying to be a pain in the ass, but how are horizontal top tubes functionally inferior? are we talking stiffness here? and would it even matter to someone like me who never races his bike aside from the occasional alleycat?

potus 02-27-06 03:47 PM

1 Attachment(s)
this one slopes 5 degrees

trackasaurus 02-27-06 04:06 PM


Originally Posted by baxtefer
sloping is fine, and practical.
I'm mentally designing my custom frame around a sloping TT. and pacenti lugs.


Just so you know, the pacenti slant 6 lugs are built around an oversize + oversize tubeset with a 1 1/8 head tube, 1 1/4 top tube and 1 3/8 down tube aka mountain os. I built my cross bike with them, and it's pretty, but also pretty beefy.

as the rumours say, darrell at lewellyn bikes in oz is coming out with a 1" headtube road os sloping lugset this year. those two are the only sloping lugsets in the universe afaik.

good luck

schnee 02-27-06 04:24 PM


Originally Posted by crushkilldstroy
not trying to be a pain in the ass, but how are horizontal top tubes functionally inferior? are we talking stiffness here? and would it even matter to someone like me who never races his bike aside from the occasional alleycat?

I'm a relative newb, so I'm not going to pass myself off as an authority. However, in this thread:

makes for a stiffer frame (smaller triangles) + more clearance for your legs when sprinting. I like em'.
and, from the previous Bowery thread:

less material- less weight...

... stiffer frame as well. Stiffer out of the saddle, I dunno if the long post can flex when you're seated.

The UCI ban on the TCR frame was initiated by competing bike makers, that filed complaints. The advantage was that the bike could be made lighter and stiffer without resorting to spending lots of money.

A couple of years later, everyone realised that they could do the same thing and petioned the UCI to unban the compact frames and now just about everybody makes one.
So, I'm not the one saying it. I'm quoting others. To be fair, I'm quoting all that out of context - I cut all the grousing out about how ugly sloped top tubes are. :)

I'm not a good enough rider to tell the difference, myself. I'm just taking issue with the notion that sloping top tubes and compact frames are useless... they have functional benefits, but they're untraditional and not to everyone's tastes.

Ken Cox 02-27-06 04:53 PM

Two thoughts:

1) a sloping top tube provides the geometry for a longer head tube, which means more distance between the headset top bearing and bottom bearing, and, intuitively, this seems stronger and allows a lower stand over height for a given head tube length; and,

2) the smaller frame requires a longer, weaker, heavier seat post, and the whole idea amounts to a meaningless styling gimmick.

:)

The above said, the bikes posted by potus and plantdude look beautiful to me.


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